RE: Would this be wrong and or illegal?
Depending on how wild it is-- I used the cows as cover. I was able to sneak up on it to about 10-15 yrds using the cows. Once they cleared it was an open shot. You will find out how small the kill zone on a pig is. Your set up will be fine. I used an old pearson compound pulling about 50 lbs with heavy aluminum arrows. That old thing only shot 180fps or so and I sill got a pass thru.
good luck.